I have another category, that I think is critical - even more so than your "10 Essentials". And that is, "Carried on your BODY" (not in a pack). In this category I put the following: whistle, knife, butane lighter, cellphone (inclusion depends on how remote you'll be and if service is a possibility). I would not argue against carrying a firesteel in-pocket rather than a lighter, but personally I carry the firesteel in my pack and the lighter in my pocket. Maybe I should reverse that.